- (the) Ivory Coast
- the Ivy League
- the jaws of a tunnel
- the jaws of a tunnel, etc.
- the jaws of death
- the jaws of death, defeat, etc.
- the jaws of defeat
- the jet set
- the jewel in the crown
- the jitters
- the joker in the pack
- the joke's on
- the joke's on sb
- the Jolly Roger
- the judiciary
- the Jurassic
- the jury is out on
- extremisms
- extremist
- extremistic
- extremists
- extremists
- extremities
- extremity
- extricate